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Python toggle boolean with function

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0

I'm trying to toggle a boolean with the help of a seperate function.
If my research is correct, there are no pointers in Python (I'm starting to learn it right now) so I'm unsure how to fix this issue.

For key presses i am using the library 'keyboard' which uses callbacks for hotkeys. Thus i have to somehow pass the toggle as a callback and need a method for toggling it. (If you have a different approach wihich could solve this its also appreciated)

Doing it inside the while loop like the shutdown call doesn't work. because the keyboard library doesn't have a simple method to check for key press or key release so it would be called repeatedly until the key is released.

import keyboard

# Global Variables
running = False

# ------------
# FUNCTIONS
# ------------

def shutdown():
 print("Tool shutting down!")
 quit()

def toggle(b):
 b = not b

def init():
 running = False
 keyboard.add_hotkey('alt+1', toggle, args=[running])

# ------------
# MAIN PROGRAM
# ------------

init()

while True:
 if keyboard.is_pressed('alt+q'):
 shutdown()

The Variable should be consistent at least in the main program itself (It can be also consistent globally, which was my latest approach that didn't work out) and be toggled once i use my set hotkey.

python reference toggle

share|improve this question

asked Mar 25 at 13:20

DJSchaffnerDJSchaffner

3811 silver badge66 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why not just running = not running instead of b = not b? Also, see this post for why your code doesn't work.
  
  – meowgoesthedog
  Mar 25 at 13:27
  
  

  
  
  
  

add a comment | 

0

I'm trying to toggle a boolean with the help of a seperate function.
If my research is correct, there are no pointers in Python (I'm starting to learn it right now) so I'm unsure how to fix this issue.

For key presses i am using the library 'keyboard' which uses callbacks for hotkeys. Thus i have to somehow pass the toggle as a callback and need a method for toggling it. (If you have a different approach wihich could solve this its also appreciated)

Doing it inside the while loop like the shutdown call doesn't work. because the keyboard library doesn't have a simple method to check for key press or key release so it would be called repeatedly until the key is released.

import keyboard

# Global Variables
running = False

# ------------
# FUNCTIONS
# ------------

def shutdown():
 print("Tool shutting down!")
 quit()

def toggle(b):
 b = not b

def init():
 running = False
 keyboard.add_hotkey('alt+1', toggle, args=[running])

# ------------
# MAIN PROGRAM
# ------------

init()

while True:
 if keyboard.is_pressed('alt+q'):
 shutdown()

The Variable should be consistent at least in the main program itself (It can be also consistent globally, which was my latest approach that didn't work out) and be toggled once i use my set hotkey.

python reference toggle

share|improve this question

asked Mar 25 at 13:20

DJSchaffnerDJSchaffner

3811 silver badge66 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why not just running = not running instead of b = not b? Also, see this post for why your code doesn't work.
  
  – meowgoesthedog
  Mar 25 at 13:27
  
  

  
  
  
  

add a comment | 

I'm trying to toggle a boolean with the help of a seperate function.
If my research is correct, there are no pointers in Python (I'm starting to learn it right now) so I'm unsure how to fix this issue.

For key presses i am using the library 'keyboard' which uses callbacks for hotkeys. Thus i have to somehow pass the toggle as a callback and need a method for toggling it. (If you have a different approach wihich could solve this its also appreciated)

Doing it inside the while loop like the shutdown call doesn't work. because the keyboard library doesn't have a simple method to check for key press or key release so it would be called repeatedly until the key is released.

import keyboard

# Global Variables
running = False

# ------------
# FUNCTIONS
# ------------

def shutdown():
 print("Tool shutting down!")
 quit()

def toggle(b):
 b = not b

def init():
 running = False
 keyboard.add_hotkey('alt+1', toggle, args=[running])

# ------------
# MAIN PROGRAM
# ------------

init()

while True:
 if keyboard.is_pressed('alt+q'):
 shutdown()

The Variable should be consistent at least in the main program itself (It can be also consistent globally, which was my latest approach that didn't work out) and be toggled once i use my set hotkey.

python reference toggle

share|improve this question

asked Mar 25 at 13:20

DJSchaffnerDJSchaffner

3811 silver badge66 bronze badges

import keyboard

# Global Variables
running = False

# ------------
# FUNCTIONS
# ------------

def shutdown():
 print("Tool shutting down!")
 quit()

def toggle(b):
 b = not b

def init():
 running = False
 keyboard.add_hotkey('alt+1', toggle, args=[running])

# ------------
# MAIN PROGRAM
# ------------

init()

while True:
 if keyboard.is_pressed('alt+q'):
 shutdown()

share|improve this question

asked Mar 25 at 13:20

DJSchaffnerDJSchaffner

3811 silver badge66 bronze badges

share|improve this question

asked Mar 25 at 13:20

DJSchaffnerDJSchaffner

3811 silver badge66 bronze badges

asked Mar 25 at 13:20

DJSchaffnerDJSchaffner

3811 silver badge66 bronze badges

asked Mar 25 at 13:20

DJSchaffnerDJSchaffner

3811 silver badge66 bronze badges

1 Answer
1

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1

Its just a problem with the scope of variables

Check this

var1 = False

def changeVar(va):
 va = not va

changeVar(var1)

print(var1)

def changeVar2():
 global var1 
 var1 = not var1
changeVar2()
print(var1)

And in your code you need to define toggle as following :

def toggle(b):
 global running
 running = not running

share|improve this answer

answered Mar 25 at 13:46

anilkunchalaeceanilkunchalaece

17188 bronze badges

add a comment | 

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1

Its just a problem with the scope of variables

Check this

var1 = False

def changeVar(va):
 va = not va

changeVar(var1)

print(var1)

def changeVar2():
 global var1 
 var1 = not var1
changeVar2()
print(var1)

And in your code you need to define toggle as following :

def toggle(b):
 global running
 running = not running

share|improve this answer

answered Mar 25 at 13:46

anilkunchalaeceanilkunchalaece

17188 bronze badges

add a comment | 

1

Its just a problem with the scope of variables

Check this

var1 = False

def changeVar(va):
 va = not va

changeVar(var1)

print(var1)

def changeVar2():
 global var1 
 var1 = not var1
changeVar2()
print(var1)

And in your code you need to define toggle as following :

def toggle(b):
 global running
 running = not running

share|improve this answer

answered Mar 25 at 13:46

anilkunchalaeceanilkunchalaece

17188 bronze badges

add a comment | 

Its just a problem with the scope of variables

Check this

var1 = False

def changeVar(va):
 va = not va

changeVar(var1)

print(var1)

def changeVar2():
 global var1 
 var1 = not var1
changeVar2()
print(var1)

And in your code you need to define toggle as following :

def toggle(b):
 global running
 running = not running

share|improve this answer

answered Mar 25 at 13:46

anilkunchalaeceanilkunchalaece

17188 bronze badges

var1 = False

def changeVar(va):
 va = not va

changeVar(var1)

print(var1)

def changeVar2():
 global var1 
 var1 = not var1
changeVar2()
print(var1)

def toggle(b):
 global running
 running = not running

share|improve this answer

answered Mar 25 at 13:46

anilkunchalaeceanilkunchalaece

17188 bronze badges

answered Mar 25 at 13:46

anilkunchalaeceanilkunchalaece

17188 bronze badges

answered Mar 25 at 13:46

anilkunchalaeceanilkunchalaece

17188 bronze badges